8th grade ch. 5 sec. 5 cancer & the environment
TRANSCRIPT
Ch. 5Ch. 5Sec. 5Sec. 5
Cancer & the Cancer & the EnvironmentEnvironment
Objectives:1.How can people’s environments affect their risk of cancer?
2.What are three carcinogens found in the environment?
chimney sweeps in Londonchimney sweeps in London
usually poor boysusually poor boyssoot ground into soot ground into skinskin
developed skin developed skin cancercancer
Mary Poppins-Chim Chim Cher-ee song
Dr. Percival PottDr. Percival Pott
recommended chimney sweeps recommended chimney sweeps bathe frequently to clean off sootbathe frequently to clean off soot
1 of 11 of 1stst scientists to understand scientists to understand environment can affect people’s environment can affect people’s healthhealth
Scientists identified the Scientists identified the carcinogens in soot.carcinogens in soot.
They are theThey are the samesame substances that make substances that make upup the tar inthe tar in
cigarette cigarette smoke.smoke.
EPAEPA EEnvironmental nvironmental PProtection rotection AAgencygency purpose:purpose:
enforce environmental lawsenforce environmental laws identify environmental identify environmental carcinogenscarcinogens
develop strategies for protecting develop strategies for protecting peoplepeople
ultraviolet lightultraviolet light decrease in protective ozone decrease in protective ozone
layer - allows more UV light layer - allows more UV light to reach Earthto reach Earth
increase in skin cancerincrease in skin cancer
Ozone hole is getting larger Ozone hole is getting larger each year!each year!
What is causing the depletion What is causing the depletion of the ozone layer?of the ozone layer?
release of release of chlorofluorocarbons chlorofluorocarbons (CFCs) (CFCs)
CFCs given off by CFCs given off by refrigerators, air refrigerators, air conditioners & conditioners & aerosol cans.aerosol cans.
skin cancer can result from overexposure to the sun
Skin Cancer (2:38)
vinyl chloridevinyl chloride colorless gas colorless gas makes PVCmakes PVCvapors cause liver, vapors cause liver, brain or lung cancerbrain or lung cancer
arsenicarsenicwood wood preservative & preservative & pesticidespesticides
2004-EPA 2004-EPA banned use in banned use in wood wood
arsenicarsenic UV UV lightlight
vinyl vinyl chloridechloride
chimney sweeps in chimney sweeps in LondonLondonusually poor boysusually poor boyssoot ground into soot ground into skinskin
developed skin developed skin cancercancer
ultraviolet lightultraviolet lightdecrease in protective decrease in protective
ozone layer - allows more ozone layer - allows more UV light to reach EarthUV light to reach Earth
increase in skin cancerincrease in skin cancer
Dr. Percival PottDr. Percival Pott
recommended chimney sweeps recommended chimney sweeps bathe frequently to reduce risk of skin bathe frequently to reduce risk of skin cancercancer
1 of 11 of 1stst scientists to understand scientists to understand environment can affect people’s environment can affect people’s healthhealth
EPAEPAEnvironmental Protection AgencyEnvironmental Protection Agency
What does What does the EPA do?the EPA do?
enforce environmental lawsenforce environmental laws identify environmental identify environmental
carcinogenscarcinogensdevelop strategies for develop strategies for
protecting peopleprotecting people
What is causing the depletion What is causing the depletion of the ozone layer?of the ozone layer?
release of release of chlorofluorocarbons chlorofluorocarbons (CFCs) (CFCs)
CFCs given off by CFCs given off by refrigerators, air refrigerators, air conditioners & conditioners & aerosol cans.aerosol cans.
causecause effecteffect